Carburetor for internal-combustion engines



Jan. 16,1923.

J. A. NEWELL. CARBURETOR FOR INTERNAL COMBUSTION ENGINES.

FILED Dec. 30. 1919.

O FI G1 G Q E O G O O C O O INVENTUR ATTORNEYS Patented Jan. 16, 1923.

JAMES ANDREW NEWELL, OF BELFAST, IRELAND.

CARIBURETOR FOR, INTERNAL-COI/IBUSTION ENGINES.

Application filed December 30, 1919.

To all whom it may concern:

Be it known that I, JAMns ANDREW NEWELL, a subject of the King of Great Britain and Ireland, residing at Belfast, county Antrim, Ireland, have invented certain new and useful Improvements in Carburetors for Internal-Combustion Engines, of which the following is a specification.

This invention relates to carburetors for internal combustion engines, and has for its object to provide a simple construction in which the fuel passages may be readily scavenged and cleared, if necessary, without stopping the engine.

A construction according to this invention is illustrated in the accompanying drawin in which Figure 1 is a vertical section through a carburetor showing the fuel nozzles connected with the induction pipe in order that they may be scavenged, and

Figure 2 is a section of the valve plug showing it connecting the float chamber with the nozzles.

In this construction, A is the induction pipe of an engine, B is the throttle valve, C are fuel nozzles, D is an auxiliary fuel supply, used for slow-running, E is the float chamber, and F is the usual air intake, all of which are of a conventional form. two-way valve G connects the induction pipe A through conduit H with the fuel nozzle C when in the scavenging position, shown in Figure 1; and when in the normal working position shown in Figure 2 the valve G puts the nozzles int-o communication with the float chamber E. The plug I of the valve G is held on its seat by a spiral spring J, and an arm K rigidly connected to the valve G can be operated from a distance in any suitable manner, to move the valve G.

The fuel tubes or nozzles C are preferably each provided with an external mushroom valve head L carried on a hollow stem M which communicates with the outside air at N. Each stem is screw-threaded at 0 so that it can be axially adjusted in the tube C and locked by a nut P. Radial openings Qv are provided adjacent the mushroom valve L and through which air can be drawn by the engine suction to assist in atomizing the fuel delivered by the nozzle.

/Vhen valves G and B are in the position Serial No. 348,884..

shown in Figure 1, the suction of the engine causes air to be drawn from the inlet along through the hollow stem M and radial openings Q, and down the nozzles it, thus clearing them of any dirt or water which may be interfering with their -isfactory operation. in practice, when it is desired to scavenge the nozzles and pass-Wes the valves G and B are put into the po 11 shown in Fig. 1, for a moment. The reverse draft quickly exhausts the fuel in the passages and sucks out any foreign matter. The valves are then returned to the normal running position, when suction is again es tablished in the normal direction and the fuel passages and nozzles are quickly filled with fuel from the well E. The engine is now supplied with fuel and continues to run in the usual manner. The above operations are instantaneous and take place before the engine has stopped, the momentum of the engine serving to carry it over the scavenging operation.

If desired, the valve G and the throttle valve B can be interconnected so that the fuel jets can be scavenged whenever the throttle is closed.

What I claim as my invention and desire to secure by Letters Patent of the United States is in a carburetor an induction pipe. a throttle valve therein, a fuel j et. a. fuel chamber, a fuel passage conducting fuel from said chamber to said jet, a scavenging passage connecting the induction pipe on the engine side of said throttle with said fuel passage. a twoway valve located at the junction of said scavenging passage with said fuel passage adapted, in one position. to put the fuel jet into communication with the fuel chamher only. and in the other position to con nect said fuel jet with said scavenging passage and to cut off its communication with said fuel chamber. substantially as set forth.

In testimony whereof I have signed my name to this specifcafion in the presence of two subscribing witnesses.

JAliIES i-kllDllElY NETELL.

itnesses W. E'USTACE BURKE, D. Brown. 

